Control panel sounds and audio,volume,advanced,speakers select appropriate speakers or audio you will find 3 drop down lists make sure you have selected the right speakers or control panel,administrive tools,computer management,device manager,sound,could be a yellow question mark? right click to re-install drivers hope this helps

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At this point I would suggest to try a full system restore as the sytem files might be corrupted. You can restore the computer back to factory default,to do so, follow the below steps:

Turn Off the computer, now as soon as you hit the power button, keep on holding "Alt" key & keep on tapping "F10" key, i.e Alt+f10, it will open the recovery console, select full factory restore and follow onscreen instruction. NOTE: This will erase all the datas on the computer.

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I too had recently lost my jpeg files from hard drive by using jpg picture recovery software like Photo Recovery After This tool can be used to restore any lost/deleted files easily. This software is awesome and can state that it won't disappoint you. Just download and check out its features.

At this point I would suggest to try a full system restore as the sytem files might be corrupted. You can restore the computer back to factory default,to do so, follow the below steps:

Turn Off the computer, now as soon as you hit the power button, keep on holding "Alt" key & keep on tapping "F10" key, i.e Alt+f10, it will open the recovery console, select full factory restore and follow onscreen instruction. NOTE: This will erase all the datas on the computer.

make sure processor fan is working fine. you may hear the sound of fan on the left side of the laptop. and make sure its not getting heat soon. If the fan is not working you need to replace the fan. If if gets heat soon that means you have to put processor cooling paste.IF the fan is working fine and the processor heat is normal, then you need to re-fix the RAM. Then it will work fine..ok